In relation to electrical circuits, we introduce definitions of
- **battery**;
- **capacitor and capacitance**;
- **resistor and resistance**;
- **electrical current.**
- and so on.
The **battery** is a special device, which produces a fixed potential difference (voltage) between two points: contacts of the battery.
The **capacitor** is a system of two conductors, which are called plates of the capacitor. Here one plate (one conductor) is positively charge, while another plate (another conductor) is negatively charged.
The **resistor** is a piece of conductor, which usually has the shape of a wire.
Electrical **current** is a motion of electric charges. It is **important** to understand the definition of the direction of the current. The direction of the current is defined as the direction of motion of positive charges. Although, in conductors, the real charges, which are moving, are electrons - negatively charged particles - the direction of current is opposite to the direction of motion of electrons.
Below you can find animations of different concepts related to electrical circuit.
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